[JS] [atoms] Use .textContent instead of .innerHTML in clear() action

[tosmolka]

Description

This PR changes atom action clear() to use .textContent attribute instead of .innerHTML to clear the element. One exception is Firefox where it keeps current workaround.

Motivation and Context

This PR is related to issue #11461 . Atom action clear() fails on pages that require Trusted Types as it causes a Trusted Types Sink violation. This can be fixed by reimplementing the same behavior without calling into .innerHTML Trusted Types Sink.

Types of changes

• Bug fix (non-breaking change which fixes an issue)

Checklist

• I have read the contributing document.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.
  • I ran action_test.html locally in a browser but I was unable to run full test suite due to unrelated issues

[CLAassistant]

All committers have signed the CLA.

[diemol]

@titusfortner @AutomatedTester do you know how we test the atoms? What is the process to tell the drivers to update them after merging this?

[diemol]

On the 02.02.23 TLC meeting it was decided to merge this and then ping ChromeDriver and GeckoDriver to update their atoms.

[diemol]

Thank you, @tosmolka!